JP6868924B1 - Multi-directional auger bit - Google Patents

Abstract

PROBLEM TO BE SOLVED: To provide a multi-directional auger bit which simultaneously excavates an excavation surface in an excavation direction and a hole wall direction, an excavation direction and a pile core direction, or all directions thereof. SOLUTION: The multi-directional auger bit 1 mounted on an auger head includes a base 2 having a tip protruding in the axial direction of the auger head, and legs 3 and 4 continuous with the base, and the base is a leg. A flat surface portion 2a continuous with the portion, first inclined portions 2b to 2d inclined from the flat surface portion toward the tip side in the axial direction of the auger head, left and right side surface portions 2f continuous from the first inclined portion, and a first portion. It is composed of a second inclined portion 2g inclined from the first inclined portion toward the axial direction of the auger head and the leg side, and the first inclined portion, the side surface portion, and the second inclined portion have a first super hard tip. Is arranged, and a second super hard tip is arranged so as to project in a direction perpendicular to the left and right side surface portions from one of the left and right side surface portions to the first inclined portion. It is 1. [Selection diagram] Fig. 1

Description

The present invention relates to a multi-directional auger bit that simultaneously excavates a drilling surface in a plurality of directions.

Conventionally, for example, in the ready-made pile construction method using a pile driver, an auger head is connected to a drive mechanism, and a foundation hole of a building, a construction hole of a continuous underground wall body, etc. are excavated in the ground. The auger bit provided at the tip of the auger head is provided with a blade for excavation. This is almost the same for the steel pipe Nakabori method.

Here, for example, in Patent Document 1, a removable earth auger bit with a built-up build-up is disclosed on the excavation head, in which the excavation blade is composed of a central tip and side tips on both sides. In this removable earth auger bit, the central tip constitutes a wedge-shaped blade that protrudes in a curved state with respect to the side tip. As an excavation blade, a blade having a self-sustaining blade function in which the cutting edge portion falls off according to the excavation action and regenerates a new cutting edge portion is applied, and the excavating blade has a rod-shaped tip embedded in the blade member body from cemented carbide. It is a thing.

Japanese Unexamined Patent Publication No. 2002-339680

However, Patent Document 1 merely discloses a detachable earth auger bit and an earth auger having an improved detachable structure.

Then, the auger bit for the auger head is attached to the outer plate or inner plate of the casing, or both the outer plate and the inner plate, and with respect to the excavation surface, the excavation direction and the hole wall direction, or the excavation direction and the pile core direction, Or, there is no conventional one that performs simultaneous excavation in all the directions. Similarly, there is no conventional one that is attached to the outside of the excavation blade and simultaneously excavates the excavation surface in both the excavation direction and the hole wall direction.

The present invention has been made in view of such a problem, and an object of the present invention is the excavation direction and the hole wall direction, the excavation direction and the pile core direction, or all of them with respect to the excavation surface. The purpose is to provide technology for simultaneous excavation in directions.

In order to solve the above problems, the auger bit according to one aspect of the present invention is an auger bit mounted on the auger head, and has a base portion whose tip protrudes in the axial direction of the auger head and is continuous with the base portion. The base portion includes a flat portion continuous with the leg portion, a first inclined portion inclined from the flat portion in the axial direction of the auger head, and the first inclined portion toward the tip side. It is composed of left and right side surface portions that are continuous from the inclined portion, and a second inclined portion that is inclined from the first inclined portion to the axial direction of the auger head and toward the leg portion side, and the first inclined portion and the side surface portion. A first super hard tip is disposed on the second inclined portion, and the second super hard tip extends from one of the left and right side surface portions to the first inclined portion, and the second super hard tip is formed on the left and right side surfaces. It is arranged so as to project in the direction perpendicular to the portion.

In state like this, as the second carbide inserts, a plurality of carbide inserts is at a predetermined distance, may be disposed in parallel with the axial direction of the auger head.

According to the present invention, it is possible to provide a technique for simultaneously excavating an excavated surface in the excavation direction and the hole wall direction, the excavation direction and the pile core direction, or all the directions thereof.

It is a block diagram of the multi-directional wood auger bit which concerns on 1st Embodiment of this invention. It is a block diagram of the multi-directional wood auger bit which concerns on 2nd Embodiment of this invention. It is a block diagram of the multi-directional wood auger bit which concerns on 3rd Embodiment of this invention. It is a figure which shows the state of mounting of the multi-directional auger bit. It is a figure which shows the state of mounting of the multi-directional auger bit.

Hereinafter, the configuration and operation of the multi-directional auger bit according to the first to third embodiments of the present invention will be described in detail with reference to the drawings.

The multi-directional auger bit according to the first to third embodiments of the present invention is attached to the outer plate or inner plate of the casing, or both the outer plate and the inner plate, and is attached to the excavation surface in the excavation direction and the hole wall direction, or. It is characterized in that simultaneous excavation is performed in the excavation direction and the pile core direction, or in all directions thereof. Further, the auger bit is attached to the outside of the excavation blade and is characterized in that the excavation surface is simultaneously excavated in both the excavation direction and the hole wall direction.

In order to realize the above operation, the multi-directional auger bit is equipped with carbide chips in the excavation direction and the hole wall direction, or in the excavation direction and the pile core direction, respectively. The size, shape, mounting angle, and number of cemented carbide tips mounted in the excavation direction, the hole wall direction, and the pile core direction can be appropriately changed according to the excavation target. Further, the hardness of the cemented carbide tip can be selected in the excavation direction, the hole wall direction, and the pile core direction, respectively, according to the excavation target. In addition, the mounting method of the multi-directional auger bit may be either a removable type (first and second embodiments) or a welding type (third embodiment). Hereinafter, the first to third embodiments will be described in detail.

<First Embodiment>

FIG. 1 shows and describes a configuration of a multi-directional auger bit according to the first embodiment of the present invention. More specifically, FIG. 1A is a perspective view of the auger bit, FIG. 1B is a plan view, and FIG. 1C is a side view. In addition, in FIG. 1A, the illustration of the hard overlay is omitted in order to clearly show the structure of each part.

As shown in these figures, the multi-directional auger bit 1 is composed of a base 2 and two legs 3 and 4 extending from the base 2. In the first embodiment, the base 2 side is also referred to as the tip of the auger bit 1, and the legs 3 and 4 are also referred to as the attachment side to the auger head or the rear end of the auger bit 1. Further, the direction in which the tip is facing is the excavation direction, and the direction perpendicular to the excavation direction is the hole wall direction or the pile core direction.

Here, the pile core direction is the "center of the pile" in all pile works such as ready-made piles, cast-in-place piles, and steel pipe piles used for foundation work, and is used for pulling out various piles, removing obstacles, etc. Means the center of the casing and excavation blades used. On the other hand, the hole wall direction refers to the outer peripheral side of piles in all pile works such as ready-made piles, cast-in-place piles, steel pipe piles used for foundation work, and casings used for pulling out various piles and removing obstacles. It means the outer peripheral side of the excavation blade, that is, the hole wall of the underground hole constructed by excavating the ground or an obstacle.

The base portion 2 has a so-called mountain-shaped shape in which the top portion protrudes toward the tip end side of the multi-directional auger bit 1 in the axial direction of the auger head. More specifically, the flat surface portion 2a of the base 2 of the multi-directional auger bit 1 is parallel to the flat surfaces of the legs 3 and 4, and the flat surface portion 2a of the base 2 is the axial direction and the tip of the auger head. Three inclined portions 2b, 2c, and 2d inclined toward the side are continuous.

In this example, the inclined portion 2b has the left end continuous with the side surface portion 2e when viewed from the tip side in the axial direction of the auger head, and the inclined portion 2d has the side surface at the right end when viewed from the tip side in the axial direction of the auger head. It is continuous with the part 2f.

The inclined portions 2b, 2c, and 2d of the base portion 2 are continuous in this order in the axial direction of the auger head, in the lateral direction when viewed from the tip side, that is, in the circumferential direction of the auger head. In the first embodiment, the inclined portion 2b is inclined toward the circumferential direction of the auger head with respect to the inclined portion 2c, and the inclined portion 2d is inclined in the circumferential direction (tilted portion) of the auger head with respect to the inclined portion 2c. It is tilted in the direction opposite to the tilt direction of 2b).

The lower ends of the inclined portions 2b, 2c, and 2d of the base portion 2 are continuous with the inclined portion 2g. The inclined portion 2g of the base portion 2 is 17.5 degrees with respect to the plane parallel to the plane portion 2a of the base portion 2, and is the axial direction of the auger head, the rear end side of the multi-directional auger bit 1, that is, the auger head of the auger bit 1. It is tilted toward the mounting side. A hard overlay 7 is disposed on the base 2.

The legs 3 and 4 extend from the base 2 toward the rear end side in the axial direction of the auger head so as to be parallel and U-shaped when viewed from the side surface at predetermined intervals. .. The legs 3 and 4 are provided with four holes 3a and 4a for mounting the multi-directional auger bit 1 on the auger head with bolts or the like.

A first cemented carbide tip 5 is arranged below the inclined portions 2b, 2c, and 2d of the base portion 2 of the multi-directional auger bit 1. According to the first cemented carbide tip 5, wear on the outside of the contact surface can be prevented. Further, a second cemented carbide tip 6 is provided from the inclined portion 2d of the base portion 2 of the multi-directional auger bit 1 to the side surface portion 2f. The second cemented carbide tip 6 has a so-called mountain-shaped shape, and the top thereof faces the hole wall direction or the pile core direction. Here, the hole wall direction and the pile core direction are directions perpendicular to the excavation direction. Therefore, when the multi-directional auger bit 1 is arranged on the outer plate of the casing, the second cemented carbide tip 6 faces the hole wall direction, and when arranged on the inner plate, the second cemented carbide tip 6 is It will face the direction of the pile core. The grades and hardness of the first and second cemented carbide tips 5 and 6 can be freely combined according to the ground or obstacle to be excavated.

Here, referring to the material of each part, SCM440 (chromoly steel) or the like can be adopted as the base material of the base portion 2, the leg portions 3, and 4. The first and second cemented carbide tips 5 and 6 include E3 (material name MG30), E4 (material name MG40), E5 (material name MG50), and E6 (material name MG60), which are JIS usage classification symbols. Etc., and CIS standard G4 (CIS grade code VC-40), G5 (CIS grade code VC-50) and the like can be adopted. However, it goes without saying that this is not limited to this.

As described above, according to the multi-directional auger bit according to the first embodiment of the present invention, the excavation direction and the hole wall direction, the excavation direction and the pile core direction, or all directions thereof with respect to the excavation surface. It is possible to perform simultaneous excavation.

<Second Embodiment>

FIG. 2 shows and describes a configuration of a multi-directional auger bit according to a second embodiment of the present invention. More specifically, FIG. 2A is a perspective view of the auger bit, FIG. 2B is a plan view, and FIG. 2C is a side view. In addition, in FIG. 2A, the illustration of the hard overlay is omitted in order to clearly show the structure of each part.

As shown in these figures, the multi-directional auger bit 11 is composed of a base 12 and two legs 13 and 14 extending from the base 12. In the second embodiment, the base 12 side is also referred to as the tip of the multi-directional auger bit 11, and the legs 13 and 14 are also referred to as the attachment side to the auger head or the rear end of the multi-directional auger bit 11. Further, the direction in which the tip is facing is the excavation direction, and the direction perpendicular to the excavation direction is the hole wall direction or the pile core direction.

The base portion 12 has a so-called mountain-shaped shape in which the top portion protrudes toward the tip end side of the multi-directional auger bit 11 in the axial direction of the auger head. More specifically, the flat surface portion 12a of the base portion 12 of the multi-directional auger bit 11 is parallel to the flat surfaces of the legs 13 and 14, and the flat surface portion 12a of the base portion 12 has the axial direction and the tip end of the auger head. Three inclined portions 12b, 12c, and 12d inclined toward the side are continuous.

In this example, the inclined portion 12b has the left end continuous with the side surface portion 12e when viewed from the tip side in the axial direction of the auger head, and the inclined portion 12d has the side surface at the right end when viewed from the tip side in the axial direction of the auger head. It is continuous with the part 12f.

The inclined portions 12b, 12c, and 12d of the base portion 12 are continuous in this order in the axial direction of the auger head, in the lateral direction when viewed from the tip side, that is, in the circumferential direction of the auger head. In the second embodiment, the inclined portion 12b is inclined in the circumferential direction of the auger head with respect to the inclined portion 12c, and the inclined portion 12d is inclined in the circumferential direction of the auger head with respect to the inclined portion 12c (inclined portion 12b). It is tilted in the direction opposite to the tilting direction of.

The lower ends of the inclined portions 12b, 12c, and 12d of the base portion 12 are continuous with the inclined portion 12g. The inclined portion 12g of the base portion 12 is directed to the auger head in the axial direction of the auger head at 17.5 degrees with respect to the plane parallel to the flat surface portion 12a of the base portion 12, to the rear end side of the auger bit 1, that is, to the auger head of the multidirectional auger bit 11. It is tilted toward the mounting side of. A hard overlay 18 is disposed on the base 12.

The legs 13 and 14 extend from the base 12 toward the rear end side in the axial direction of the auger head so as to be parallel and U-shaped when viewed from the side surface at predetermined intervals. .. The legs 13 and 14 are provided with four holes 13a and 14a, respectively, for mounting the multi-directional auger bit 11 on the auger head with bolts or the like.

A first cemented carbide tip 15 is arranged below the inclined portions 12b, 12c, and 12d of the base portion 12 of the multi-directional auger bit 11. According to the first cemented carbide tip 15, wear on the outside of the contact surface can be prevented. Further, from the inclined portion 12d of the base portion 12 of the multi-directional auger bit 11 to the side surface portion 12f, the two second cemented carbide tips 16 and 17 are spaced apart from each other in the axial direction of the auger head toward the rear end side. It is provided in parallel. The second cemented carbide tips 16 and 17 have a so-called chevron shape, and the top thereof faces the hole wall direction or the pile core direction. Here, the hole wall direction and the pile core direction are directions perpendicular to the excavation direction. Therefore, when the multi-directional auger bit 11 is arranged on the outer plate of the casing, the second cemented carbide tips 16 and 17 face the hole wall direction, and when arranged on the inner plate, the second carbide tip 16 and 17 face the hole wall direction. The carbide tips 16 and 17 face the pile core direction. The grades and hardnesses of the first and second cemented carbide tips 15, 16 and 17 can be freely combined according to the ground or obstacle to be excavated.

Here, referring to the material of each part, SCM440 (chromoly steel) or the like can be adopted as the base material of the base portion 12, the leg portions 13, and 14. The first and second cemented carbide tips 15, 16 and 17 are E3 (material name MG30), E4 (material name MG40), E5 (material name MG50) and E6 (material name) in the JIS usage classification symbol. MG60) and the like, CIS standard G4 (CIS grade code VC-40), G5 (CIS grade code VC-50) and the like can be adopted. However, the present invention is not limited to this.

As described above, according to the auger bit according to the second embodiment of the present invention, the excavation direction and the hole wall direction, the excavation direction and the pile core direction, or all the directions at the same time with respect to the excavation surface. It becomes possible to excavate.

<Third Embodiment>

FIG. 3 shows and describes a configuration of a multi-directional auger bit according to a third embodiment of the present invention. More specifically, FIG. 3A is a perspective view of the multi-directional auger bit, FIG. 3B is a plan view, and FIG. 3C is a side view. In addition, in FIG. 3A, the illustration of the hard overlay is omitted in order to clearly show the structure of each part.

As shown in these figures, the multi-directional auger bit 21 is composed of a base portion 22 and a leg portion (also referred to as a welded portion) 23 extending from the base portion 22. In the first embodiment, the base 22 side is also referred to as the tip of the auger bit 21, and the welded portion 23 side is also referred to as the attachment side to the auger head or the rear end of the auger bit 21. Further, the direction in which the tip is facing is the excavation direction, and the direction perpendicular to the excavation direction is the hole wall direction or the pile core direction.

The base portion 22 has a so-called mountain-shaped shape in which the top portion protrudes toward the tip end side of the multi-directional auger bit 21 in the axial direction of the auger head. More specifically, the flat surface portion 22a of the base portion 22 of the multi-directional auger bit 21 is parallel to the flat surface portion 23, and the flat surface portion 22a of the base portion 22 is on the axial direction and the tip side of the auger head. Three inclined portions 22b, 22c, and 22d inclined toward the direction are continuous.

In this example, the inclined portion 22b has the left end continuous with the side surface portion 22e when viewed from the tip side in the axial direction of the auger head, and the inclined portion 22d has the side surface at the right end when viewed from the tip side in the axial direction of the auger head. It is continuous with the part 22f.

The inclined portions 22b, 22c, and 22d of the base portion 22 are continuous in this order in the axial direction of the auger head, in the lateral direction when viewed from the tip side, that is, in the circumferential direction of the auger head. In the third embodiment, the inclined portion 22b is inclined toward the circumferential direction of the auger head with respect to the inclined portion 22c, and the inclined portion 22d is inclined with respect to the inclined portion 22c in the circumferential direction of the auger head (tilted portion 22b). It is tilted in the direction opposite to the tilting direction of.

The lower ends of the inclined portions 22b, 22c, and 22d of the base portion 22 are continuous with the inclined portion 22g. The inclined portion 22g of the base portion 22 is 15 degrees with respect to the plane parallel to the flat surface portion 22a of the base portion 22, and is in the axial direction of the auger head, the rear end side of the auger bit 21, that is, the mounting side of the auger bit 21 to the auger head. It is tilted toward. A hard overlay 27 is arranged on the base 22. The leg portion 23 extending in the rear end direction from the base portion 22 is a portion to be welded when the auger bit 1 is fixed to the auger head.

A first cemented carbide tip 25 is arranged below the inclined portions 22b, 22c, and 22d of the base portion 22 of the multi-directional auger bit 21. According to the first cemented carbide tip 25, wear on the outside of the contact surface can be prevented. Further, a second cemented carbide tip 26 is provided from the inclined portion 22d of the base portion 22 of the multi-directional auger bit 21 to the side surface portion 22f. The second cemented carbide tip 26 has a so-called mountain-shaped shape, and the top thereof faces the hole wall direction or the pile core direction. Here, the hole wall direction and the pile core direction are directions perpendicular to the excavation direction. Therefore, when the multi-directional auger bit 21 is arranged on the outer plate of the casing, the second cemented carbide tip 26 faces the hole wall direction, and when arranged on the inner plate, the second cemented carbide tip 26 It will face the direction of the pile core. The grades and hardness of the first and second cemented carbide tips 25 and 26 can be freely combined according to the ground or obstacle to be excavated.

Here, referring to the material of each part, SCM440 (chromoly steel) or the like can be adopted as the base material of the base portion 22 and the leg portion 23. The first and second cemented carbide tips 25 and 26 include E3 (material name MG30), E4 (material name MG40), E5 (material name MG50), E6 (material name MG60), etc., which are used as JIS usage classification symbols. CIS standard G4 (CIS grade code VC-40), G5 (CIS grade code VC-50) and the like can be adopted. However, it goes without saying that this is not limited to this.

As described above, according to the multi-directional auger bit according to the third embodiment of the present invention, the excavation direction and the hole wall direction, the excavation direction and the pile core direction, or all directions thereof with respect to the excavation surface. It is possible to perform simultaneous excavation.

Next, FIG. 4 shows how the first and second multi-directional auger bits of the present invention are attached to the casing, and the effects thereof will be described in detail. More specifically, FIG. 4 (a) is a perspective view showing the state of mounting, FIG. 4 (b) is a plan view showing the state of mounting, and FIG. 4 (c) is a side view showing the state of mounting.

As shown in these figures, when the multi-directional auger bit is attached to the outer plate of the casing and used, the first carbide tip mounted in the excavation direction excavates the excavation direction and the hole wall direction side. The second cemented carbide tip attached to the hole alleviates the earth pressure and friction from the hole wall side, and at the same time, increases the size of the pile diameter. The size of the pile diameter can be increased by arbitrarily changing the size of the second cemented carbide tip mounted in the hole wall direction.

Then, the second cemented carbide tip mounted on the hole wall direction side assists the excavated soil excavated by the first cemented carbide tip mounted in the excavation direction to be scraped upward from the excavated surface, thereby causing the casing. It relieves the earth pressure and friction applied to the tip of the excavation and improves excavation efficiency.

Further, when the second cemented carbide tip mounted on the hole wall direction side excavates the hole wall, it gives a screwing effect on the rotation direction side, and the excavation force is increased.

Further, in the obstacle removal excavation, a wider excavation width is obtained by excavating the outer side of the excavation by the second cemented carbide chip mounted in the excavation direction by the second cemented carbide chip mounted in the hole wall direction. Therefore, it is possible to remove obstacles and excavate the size by simply installing the multi-directional auger bit.

Then, by changing the number of the second cemented carbide chips to be mounted in the hole wall direction, the excavation path (path) becomes uniform, so that the effect of increasing the size of the pile diameter or the effect of increasing the size of the obstacle removal diameter can be obtained. Go up. For example, in the example of the figure, the second cemented carbide tip mounted in the hole wall direction alternately mounts one multi-directional auger bit 1 and two multi-directional auger bits 11.

Further, by mounting the second cemented carbide tip on the hole wall direction side, the load applied to the outside of the casing is reduced, so that the durability of the casing itself is improved.

On the other hand, when the auger bit is attached to the inner plate of the casing and used, the first carbide tip attached in the excavation direction excavates the excavation direction and the second carbide tip attached to the pile core direction side. However, the earth pressure and friction from the pile core side are alleviated.

Then, the second superhard tip mounted on the pile core direction side assists the excavated soil excavated by the first superhard tip mounted on the excavation direction side to be scraped upward from the excavated surface, thereby causing the casing. The earth pressure and friction applied to the tip of the sill are alleviated to improve the excavation efficiency, and at the same time, the efficiency of excavated soil inside the casing is increased.

Further, when the second cemented carbide tip mounted on the pile core direction side excavates the inside of the casing, it gives a screwing effect on the rotation direction side, and the excavation force is increased.

Further, in the obstacle removal excavation, a wider excavation width is obtained by excavating the inside of the excavation by the first cemented carbide chip mounted in the excavation direction by the second cemented carbide tip mounted in the pile core direction. Therefore, the size of the obstacle inside the casing can be reduced only by attaching the auger bit, and the efficiency of taking out the obstacle inside the casing is improved. The size of the obstacle can be reduced by arbitrarily changing the size of the second cemented carbide tip mounted in the direction of the pile core.

Then, by changing the number of the second cemented carbide chips to be mounted in the pile core direction, the excavation path (path) becomes uniform, so that the effect of removing the excavated soil and obstacles is further improved. For example, in the example of the figure, one multi-directional auger bit 1 and two multi-directional auger bits 11 are alternately attached to the chips mounted in the pile core direction.

Further, by mounting the second cemented carbide tip on the pile core direction side, the load applied to the inside of the casing is reduced, so that the durability of the casing itself is improved.

Next, FIG. 5 shows how the first and second multi-directional auger bits of the present invention are attached to the outside of the screw-shaped auger head (also referred to as an excavation blade), and the effect thereof will be described. 5 (a) is a side view showing how the multi-directional auger bit is attached to the auger head, and FIG. 5 (b) is a plan view showing how the multi-directional auger bit is attached to the auger head. is there.

As shown in these figures, when the multi-directional auger bit is attached to the outside of the excavation blade and used, the first carbide tip mounted in the excavation direction excavates the excavation direction and the hole wall direction side. The second carbide tip attached to the hole alleviates the earth pressure and friction from the hole wall side, and at the same time, increases the size of the pile diameter. The size of the pile diameter can be increased by arbitrarily changing the size of the second tip to be mounted in the hole wall direction.

Then, when the second cemented carbide tip mounted on the hole wall direction side excavates the hole wall, the screwing effect is further given to the rotation direction side, so that the biting force in the excavation direction is increased and the excavation efficiency is improved.

Further, by simultaneously excavating the first and second tips mounted in both the excavation direction and the hole wall direction, the amount of excavated soil scraped up by the spiral of the excavation blade is increased, and the excavation efficiency is improved. By mounting the second cemented carbide tip on the hole wall direction side, the load applied to the excavation blade is reduced, so that the durability of the excavation blade itself is improved.

Although the first to third embodiments of the present invention have been described above, the present invention is not limited to this, and various improvements and changes can be made without departing from the spirit of the present invention.

For example, the multi-directional auger bit for the casing auger according to the present embodiment can be used for construction using, for example, a prefabricated pile construction method, a steel pipe middle moat construction method, or the like, and during these constructions, the cemented carbide tip is chipped or slips off. , And wear is less than before.
The present invention also includes the following aspects.
That is, a multi-directional auger bit mounted on the auger head, the first cemented carbide tip having a base portion having a tip protruding in the axial direction of the auger head and protruding in the excavation direction at the tip of the base portion. A multi-directional auger bit in which a second cemented carbide chip protruding in the hole wall or pile core direction is arranged and installed.

1 ... Multi-directional auger bit, 2 ... Base, 2a ... Flat part, 2b, 2c, 2d ... Inclined part, 2e, 2f ... Side part, 2g ... Inclined part, 3 ... Leg part, 3a ... Hole part, 4 ... Leg Part, 4a ... Hole, 5 ... Carbide tip, 6 ... Carbide tip, 7 ... Hard overlay, 11 ... Multi-directional auger bit, 12 ... Base, 12a ... Flat part, 12b, 12c, 12d ... Inclined part, 12e, 12f ... Side surface, 12g ... Inclined, 13 ... Leg, 13a ... Hole, 14 ... Leg, 14a ... Hole, 15 ... Carbide tip, 17 ... Carbide tip, 18 ... Hard overlay, 21 ... Multi-directional auger bit, 22 ... Base, 22a ... Flat surface, 22b, 22c, 22d ... Inclined portion, 22e, 22f ... Side surface, 22g ... Inclined portion, 23 ... Leg, 25 ... Carbide tip, 26 ... Carbide tip, 27 ... Hard overlay.

Claims (2)

It is a multi-directional auger bit attached to the auger head.
A base whose tip protrudes in the axial direction of the auger head, and
The base is provided with continuous legs.
The base portion includes a flat surface portion continuous with the leg portion, a first inclined portion inclined from the flat surface portion in the axial direction of the auger head and toward the tip end side, and left and right side surfaces continuous from the first inclined portion. It is composed of a portion and a second inclined portion that is inclined from the first inclined portion toward the axial direction of the auger head and the leg side.
A first cemented carbide tip is disposed on the first inclined portion, the side surface portion, and the second inclined portion, and the second inclined portion extends from one of the left and right side surface portions to the first inclined portion. A multi-directional auger bit in which a carbide tip is arranged so as to project in a direction perpendicular to the left and right side surface portions. The multi-directional auger bit according to claim 1 , wherein as the second cemented carbide tip, a plurality of cemented carbide tips are arranged in parallel with the axial direction of the auger head at predetermined intervals.

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